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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f7a6013f1ae923a7969da30b05b4337e00850fc8a35f5c78ea0684b12c59d3d' 
  AND token = 'bA3kXPOSH6Moeb5sBY8Lg67NTGCjPg2zcdpuv/lcV5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}